Koa-validate NPM

koa-validate

validate koa request params and format request params

Installation

$ npm install koa-validate --save

Basic usage:

'use strict';
var koa = require('koa');
var app = koa();
var router = require('koa-router')();
require('koa-validate')(app);

app.use(require('koa-body')({multipart:true , formidable:{keepExtensions:true}}));
app.use(router.routes()).use(router.allowedMethods());
router.post('/signup', function * () {
	//optional() means this param may not in the params.
	this.checkBody('name').optional().len(2, 20,"are you kidding me?");
	this.checkBody('email').isEmail("your enter a bad email.");
	this.checkBody('password').notEmpty().len(3, 20).md5();
	//empty() mean this param can be a empty string.
	this.checkBody('nick').optional().empty().len(3, 20);
	//also we can get the sanitized value 
	var age = this.checkBody('age').toInt().value;
	yield this.checkFile('icon').notEmpty().size(0,300*1024,'file too large').move("/static/icon/" , function*(file,context){
		//resize image
	});
	if (this.errors) {
		this.body = this.errors;
		return;
	}
});
router.get('/users', function * () {
	this.checkQuery('department').empty().in(["sale","finance"], "not support this department!").len(3, 20);	
	this.checkQuery('name').empty().len(2,20,"bad name.").trim().toLow();
	this.checkQuery('age').empty().gt(10,"too young!").lt(30,"to old!").toInt();
	if (this.errors) {
		this.body = this.errors;
		return;
	}
});
router.get('/user/:id', function * () {
	this.checkParams('id').toInt(0);
	if (this.errors) {
		this.body = this.errors;
		return;
	}
});
//json body,we can check it using [json path](https://github.com/flitbit/json-path)(like xpath)
router.post('/json' , function*(){
	this.checkBody('/store/book[0]/price').get(0).eq(8.95);
	this.checkBody('#/store/book[0]/category').first().trim().eq('reference');
	if (this.errors) {
		this.body = this.errors;
		return;
	}
})

app.listen(3000);

API

checkBody,checkQuery,checkParams will return a Validator instance. when use require('koa-validate')(app) ,the request context will bind the method:

checkBody(fieldName,transFn) - check POST body.,transFn see json-path.it will not use json path if transFn is false.
checkQuery(fieldName,transFn) - check GET query.,transFn see json-path.it will not use json path if transFn is false.
checkParams(fieldName) - check the params in the urls.
checkFile(fieldName,deleteOnCheckFailed) - check the file object, if you use koa-body.this function will return FileValidator object. deleteOnCheckFailed default value is true
checkHeader(fieldName) - check the params in the request http header.

Validator API

Access validator status:

addError(tip) - add an error to validator errors.
hasError() - check if validator has errors.
value - the value of current validator.

Validators:

options,version or locale please see validator

optional() - the param may not in the params.if the param not exists,it has no error,no matter whether have other checker or not.
empty(tip) - the params can be a empty string.
notEmpty(tip) - check if the param is not empty.
notBlank(tip) - check if the param is not blank,use /^\s*$/gi reg to check.
match(pattern,tip) - pattern must be a RegExp instance ,eg. /abc/i
notMatch(pattern,tip) - pattern must be a RegExp instance ,eg. /xyz/i
ensure(assertion, tip, shouldBail) if assertion is false,the asserting failed.
ensureNot(assertion, tip, shouldBail) if assertion is true,the asserting failed.
isInt(tip,options) - check if the param is integer.
isFloat(tip,options) - check if the param is float.
isLength(min,max,tip) - check the param length.
len(min,max,tip) - the abbreviation of isLength.
isIn(arr,tip) - check if the param is in the array.
in(arr,tip) - the abbreviation of isIn.
eq(value,tip) - check if the param equal to the value.
neq(value,tip) - check if the param not equal to the value.
gt(num,tip) - check if the param great then the value.
lt(num,tip) - check if the param less then the value.
ge(num,tip) - check if the param great then or equal the value.
le(num,tip) - check if the param less then or equal the value.
contains(str,tip) - check if the param contains the str.
notContains(str,tip) - check if the param not contains the str.
isEmail(tip,options) - check if the param is an email.
isUrl(tip,options) - check if the param is an URL.
isIp(tip) - check if the param is an IP (version 4 or 6).
isAlpha(tip,locale) - check if the param contains only letters (a-zA-Z).
isNumeric(tip) - check if the param contains only numbers.
isAlphanumeric(tip,locale) - check if the param contains only letters and numbers.
isBase64(tip) - check if a param is base64 encoded.
isHexadecimal(tip) - check if the param is a hexadecimal number.
isHexColor(tip) - check if the param is a hexadecimal color.
isLowercase(tip) - check if the param is lowercase.
isUppercase(tip) - check if the param is uppercase.
isDivisibleBy(num,tip) - check if the param is a number that's divisible by another.
isNull(tip) - check if the param is null.
isByteLength(min,max,tip) - check if the param's length (in bytes) falls in a range.
byteLength(min,max,tip) - the abbreviation of isByteLength.
isUUID(tip,version) - check if the param is a UUID (version 3, 4 or 5).
isDate(tip) - check if the param is a date.
isAfter(date,tip) - check if the param is a date that's after the specified date.
isBefore(date,tip) - check if the param is a date that's before the specified date.
isCreditCard(tip) - check if the param is a credit card.
isISBN(tip,version) - check if the param is an ISBN (version 10 or 13).
isJSON(tip) - check if the param is valid JSON (note: uses JSON.parse).
isMultibyte(tip) - check if the param contains one or more multibyte chars.
isAscii(tip) - check if the param contains ASCII chars only.
isFullWidth(tip) - check if the param contains any full-width chars.
isHalfWidth(tip) - check if the param contains any half-width chars.
isVariableWidth(tip) - check if the param contains a mixture of full and half-width chars
isSurrogatePair(tip) - check if the param contains any surrogate pairs chars.
isCurrency(tip,options) - check if the param is a currency.
isDataURI(tip) - check if the param is a data uri.
isMobilePhone(tip,locale) - check if the param is a mobile phone.
isISO8601(tip) - check if the param is a ISO8601 string. eg.2004-05-03
isMACAddress(tip) - check if the param is a MAC address.eg.C8:3A:35:CC:ED:80
isISIN(tip) - check if the param is a ISIN.
isFQDN(tip,options) - check if the param is a fully qualified domain name. eg.www.google.com

Sanitizers:

default(value) - if the param not exits or is an empty string, it will take the default value.
toDate() - convert param to js Date object.
toInt(tip,radix,options) - convert param to integer.radix for toInt,options for isInt.
toFloat(tip) - convert param to float.
toLowercase() - convert param to lowercase.
toLow() - same as toLowercase.
toUppercase() - convert param to uppercase.
toUp() - same as toUppercase.
toBoolean() - convert the param to a boolean. Everything except for '0', 'false' and '' returns true. In strict mode only '1' and 'true' return true.
toJson(tip) - convert param to json object.
trim(chars) - trim characters (whitespace by default) from both sides of the param.
ltrim(chars) - trim characters from the left-side of the param.
rtrim(chars) - trim characters from the right-side of the param.
escape() - replace <, >, & and " with HTML entities.
stripLow() - remove characters with a numerical value < 32 and 127, mostly control characters.
whitelist(value) - remove characters that do not appear in the whitelist.
blacklist(value) - remove characters that appear in the blacklist.
encodeURI() - ref mdn encodeURI
decodeURI(tip) - ref mdn decodeURI
encodeURIComponent() - ref mdn encodeURIComponent
decodeURIComponent(tip) - ref mdn decodeURIComponent
replace(regexp|substr, newSubStr|function) - the same as String replace
clone(newKey,newValue) - clone current value to the new key, if newValue supplied , use it. eg. this.checkBody('v1').clone('md5').md5(); then your can use this.request.body.md5.
encodeBase64() - encode current value to base64 string.
decodeBase64(inBuffer,tip) - decode current base64 to a normal string,if inBuffer is true , the value will be a Buffer.
hash(alg , encoding) - hash current value use specified algorithm and encoding(if supplied , default is 'hex'). ref hash
md5() - md5 current value into hex string.
sha1() - sha1 current value into hex string.

For json path:

check(fn,tip,scope) - if fn return false then check failed.fn format function(value,key,requestParams):boolean
filter(fn,scope) - filter the value if value is array.fn format function(value,index,key,requestParams):boolean
get(index) - change the value to the specified index value
first() - get the first value!

FileValidator:

Validators:

empty() - current file field can to be a empty file.
notEmpty(tip) - current file field can not to be a empty file.
size(min,max,tip) - limit the file size.
contentTypeMatch(reg,tip) - check the file's contentType with regular expression.
isImageContentType(tip) - check the file's contentType if is image content type.
fileNameMatch(reg,tip) - check the file's name with regular expression.
suffixIn(arr,tip) - check the suffix of file's if in specified arr. arr eg. 'png','jpg'

Sanitizers:

File sanitizers are generators,we should use yield to execute them. eg. yield this.checkFile('file').notEmpty().copy('/');

move(target,afterMove) - move upload file to the target location. target can be a string or function or function*.if target end with '/' or '\',the target will be deemed as directory. target function interface:string function(fileObject,fieldName,context).this function will return a string of the target file. afterMove:it can be a function or function*.interface:function(fileObject,fieldName,context)
copy(target,afterCopy) - move upload file to the target location. target can be a string or function or function*. target function interface:function (fileObject,fieldName,context) . afterCopy:it can be a function or function*.interface:function(fileObject,fieldName,context)
delete() - delete upload file.

How to extends validate:

var Validator = require('koa-validate').Validator;
// to do what you want to.
//you can use this.key ,this.value,this.params,this.context,this.exists
//use addError(tip) , if you meet error.